To improve the air quality at urban intersections, Wind Augmentation Purifying Unit (WAYU) is developed by the Council of Scientific and Industrial Research – National Environmental Engineering Research Institute (CSIR- NEERI) as a part of the Technology Development Project being funded by the Department of Science and Technology. The device has been indigenously developed can purify the air in an area of 500-meter square. The device consumes only a half unit of electricity for 10 hours of running. The device equipped with ultraviolet lamps and a catalyst-based system to remove poisonous gases such as volatile organic compounds (VOCs), Hydrocarbons (HCs), and carbon monoxide. This device works primarily on two principles:
I. Wind Generation for dilution of Air Pollutants
II. Active Pollutants Removal
The device uses low-speed wind generators, appropriate size filters for long operation cycles with reasonable efficiency, and a thermal oxidizer for the removal of carbon monoxide and hydrocarbons, including VOCs. The air is passed through the filters and where the particulates are removed. The air generators without a filter can help in augmenting wind turbulence in the near zone so that dilution takes place (mimicking nature). The next level where active pollutants are removed uses filters and a thermal system. The air is heated inside the specially designed with surface and retention time, within the thermal oxidizers where the carbon monoxide, hydrocarbons, VOCs get converted to carbon dioxide. At the outlet of the device, the air has some residual velocity. This velocity of air creates turbulence in the atmosphere which thereby helps to bring down the pollutant concentrations by the method of dispersion. The device has been tested at a traffic junction, and it is found to reducing the pollutant concentrations by 40-60%.